Switch-locking device.



J. A. NASH.

SWITCH LOCKING DEVICE.

APPLICATION FILED 123.13, 1913.

1,1O6,1 54:. Pate ted Aug. 4, 1914.

WITNESSES INVENTOR ATTOR N EY "UNITED STATES PATENT OFFICE.

JOHN A. NASH, OF BUTLER, PENNSYLVANIA.

SWITCH-LOCKING DEVICE.

To all whom it may concern Be it known that I, JOHN A. Nnsri, a citizenof'the United States of A ner ca, re-

" siding at Butler, in the county of Butler and State of Pennsylvania,have invented certain new and, useful Improvements in Switch-LockingDevices, of which the following is a specification, reference belng hadtherein to the accompanying drawing.

This invention relates to a switch locking device, and my invention aimsto provide a simple, durable, inexpensive and ad ustable lock holder bywhich the handle of a single or double switch blade can be locked in anopen position and thereby prevent the switch blade from beingaccidentally closed or tampered with. Myinvention further aims toaccomplis the above results by a mechanical construction consisting ofcomparatively few parts that will be hereinafter specifically described"and a handle 4. -The blades 3 are adapted to engage contactposts 5 forcompleting an electric circuit, and in order to hold the knife switchinan open position I resort to' the use of an adjustable device that canbe positioned to lock knife switches of various sizes in an openposition when occasion so requires.

The switch board 1 is, provided with an adjustable screw 5 thatis heldin adjusted Specification of Letters Patent.

Patented Aug. 4, 1914;.

Application filed February 13, 1913. Serial No. 748,116.

position by jam nuts 7 arranged upon said screw and engaging both facesof the switch board. The screw 7 is adjustable in a plane at rightangles with respect to the plate of the switch board.

- The upper end of the screw 6 is provided with a conventional form oflock 8 having a pivoted shackle 9. This shackle can be easily placedover. thehandle 4 and closed to prevent the handle 4 from being moved.The lock 8 is of the ordinary and well known type commonly styled a padlock and is 0perable by a key whereby the shackle 9 can be opened topermit of the knife switch being closed to complete an electric circuit.

It is apparent that a similar locking device can be used for retainingthe knife switch in a closed position and in either instance the switchcannot be tampered with after it has been adjusted.

One embodiment of my invention has been illustrated, but it is to beunderstood that the structural elements are susceptible to such changesas fall within the scope of the appended claim. hat I'claim is 'A' lockfor blade switches having an adjustable screw arranged on the basethereof, a pair of jam nuts carried by said screw for maintaining thescrew in the adjusted position, and-a shackle carried onthe upper end ofsaid lock and adapted for engaging over the handle portion of a switchfor locking the said switch'in position. I

In testimony whereof I afiix my signature in'the presence of twowitnesses. JOHN A. NASH.

Witnesses:

J. A. TURNER, N. C. MOCLEALLAN, Jr.

